Driven-well tool



Feb. 18, 1930. L. STEINER ET'AL 1,747,606

DRIVEN WELL TOOL Filed June 30. 1926' Patented Feb. 18, 1930' UNITED STATES PATENT OFFICE LUDWIG STEINER, OF BERLIN, AND VICTOR GUTMANN, OF NUREMBERG, GERMANY, ASSIG-NORS TO SIEMENS-SCHUCKERTWERKE GESELLSCHAF'I MIT BESCHRANKTER HAF'IUNG, OF SIEMENSS'IAD'I, NEAR BERLIN, GERMANY, A CORPORATION OF GER- MANY DRIVEN-WELL TOOL Application filed June 30, 1926, Serial No. 119,652, and in Germany m 4, 1925.

pressure, above ground. The driving medium under pressure is then conducted to the implement, tool or instrument which has been lowered into the bore hole, by means ble difiiculties.

of a system of pipes. This pipe line must be capable of withstanding the high pressure of the driving medium and the joints of the individual pipe lengths must be well packed. In the rough boring process. the provision of a good packing offers considera- Our invention relates to a hydraulically or pneumatically operated implement, tool or instrument for boring wells or sinking shafts in which the long supply pipeline under high internal pressure and its drawbacks are eliminate According to our invention the driving medium is put under pressure only at the actual working place, i. e. in the bore hole, well or shaft by means of an electric motor ground. The electric motor and the pump which places the driving medium under pressure are preferably combined into a selfcontained unit with the implement or tool. The construction of the unit may be further simplified by arranging the individual machines or members, such as the motor, the pump, the pressure cylinder and so on coaxially.

An embodiment of our invention as applied to a gripping implement is illustrated in the accompanying drawing, which is' a view in longitudinal section..

Referring to the drawing, 1 is a tube lined bore hole, well or shaft into which a broken off boring-bar 2 or the like has dropped and which must be removed. For engaging this bar a tool of the well'known gripper type with two jaws 3, 4 is employed. These jaws I are provided with flared extensions 5 and 6 which facilitate the catching and eifect the guidance of the bar between the jaws. The jaws are pivoted at 7 and 8 within the cylindrical casing 9. The upper ends 10, 11 of the double armed gripper levers are provided with conical or tapering recesses. Between these ends is pushed the cone 12 mounted upon the piston13 guided in the'pressure cylinder 14. Between the piston and the cylinder a leather packing collar 15 is provided.

The pressure cylinder 14 is screwed with its lower end into the casing 9 ofthe gripping tool and with its upper end over the storage receptacle 16 for the water to beput under pressure. Upon the receptacle 16 is mounted the electric motor 17 by means of the flange 18 The pump 21 is an ordinary rotary pump Such a pump is particularly suitable for operating ourfimproved implement, since high pressures may be obtained then with little space requirement and with small delivery volumes. which is supplled with current from above The complete implement or tool is suspended from a supporting rod 27, adjacent to which the cable 28 for the supply of the electric motor with current is led above ground.

Our improved implement or tool operates in the following manner: In the inopera-, tive position of the implement the rece tacle 16 is filled with liquid, the piston 13 in the pressure cylinder is raised and the gripper jaws 3 and 4 are spread apart. In this state the tool is lowered into the bore hole. As soon as an obstacle is encountered in the bore hole the motor is started. The pump 21 then sucks liquid from the storage receptacle 16 through the opening 23 and forces it at 24 into the pressure cylinder 14. The piston .13 in the cylinder 14-. then moves downwards and forces the arms 10, 11 of the hinged gripper apart by means of the cone'12 and switched off automatically by means of an automatic maximum switch.

The implement together with the articl gripped is then raised by means f the suspension rod 27 and'lifted out of t e bore hole.- By reversing the direction of rotation of the motor by which the liquid is retransierred from cylinder 14 to receptacle 16, the indi-. vidual movable parts of the implement are returned into their initial position and the gripped article released. In order to accelerate the removal of the water from the pressure cylinder 14 the pump may in returning the piston be assisted by a spring 25 provided between the cone 12 and the abutment 26 for, the article to be gripped.

' It will'be understood that instead of the gripping implement described and illustrated other tools, such as a tool for perforating the linin tube of the bore hole 1 may be provide in which case the punches may be operated the parts 10 and 11, for instance.

We desire to-have it distinctly understood that we do not intend to limit ourselves to the exact details shown or described, but that we I tor, a directly couple intend to include as part of our invention all such changes and modifications of arts as would suggest themselves to persons illed in the art and as would fall within the scope of the claims. v 1

' We claim as our invention 1. A well tool comprising an electric mopump and a cylinder directly adjacent to said pump and into which the operating medium is dischar ed by the pump, a piston disposed in said cyfiinder and an operating tool directly connected with and actuated by said piston, all or said elements. forming together a tool entity which can be lowered into a well.

2. A well tool comprising an electric mo;- tor, a directly coupled pump,a liquid storage tank for supplyin an operating llquid to the pump, and a cylinder directly adjacent to said pump and. into which the operating medium is discharged by the pump, a piston disposed in said cylinder and an operating tool directly connected with and actuated by said piston, all of said-elements forming together a substantially" cylindrical tool entity which can be lowered into a well.

3. A well total comprising an electric motor,

a'directly coupled pump, a liquid storage tank for supplying an operatin pump, and a cylinder directl adjacent to said ump and into whichthe operating medium is discharged by the pump, a piston disposed in said cylinder and an operating tool direct ly connected with and-actuated by said piston,

liquid to the all of said elements being moimted in coaxial relation to each other and forming together a substantially cylindrical tool" entity which can be lowered into a well.

4. A Well tool comprising an electric motor,

a rotary piston pump directly coupled with said motor, a liquid storage tank for supplying an operating liquid to the pump and contaming the int'ake end of the pump, and a cylinder mounted so as to surround the discharge and of the pump and containing a piston operated b the liquid discharged by the pump into sai cylinder, and an operating tool directly coupled with said piston, all of said elements being arranged in co-axial relation to each other and forming a substantially cylindrical tool entity which can be lowered into a well.

In .testimony whereof we afiix our signatures. v

LUDWIG STEINER. VICTOR GUTMANN. 

